Means for shaping the bores of mouthpieces



June 25, 1951 w. GEMEINHARDT 2,553,649

MEANS FOR SHAPING THE BORES OF MOUTHPIECES Filed July 5, 1946 2 Sheets-Sheet 1 WHEY? GEWMDT EM A2; 40%

attorney June 26, 1951 w. GEMEINHARDT MEANS FOR SHAPING THE BORES OF MOUTHPIECES 2 Sheets-Sheet 2 Filed July 5, 1946 Enventor (Ittorneg designated by the reference numeral MA.

Patented June 26, 1951 uui'rsn s'r rris 7 I MEAN S FGR SHAPING THE BORES O MOUTHPIECES 6 Claims.

.. In the drawings:

Fig. 1 is a longitudinal sectional view of a mouthpiece in a preliminary stage of the manufacture thereof;

Fig. 2 is a view similar to Fig. 1 showing the mouthpiece after it is operated on by the means of the present invention;

Fig. 2A is a sectional view on the line 2A2A of Fig. 2;

Fig. 3 is a view of the bore-shaping means embodying the present invention, illustrating the manner of using said means;

Fig. 4 is a sectional view on the line 4-4 of Fig. 3;

Figs. 4A and 4B are end views of tools of different sizes;

Fig; 4C is an end view, on an enlarged scale, of a part of the tool-revolving device illustrated in Fig. 3;

Fig. 5 is a View similar to Fig. 3 showing another form of the invention;

Fig. 6 is a top plan view of a part of the apparatus illustrated in Fig. 5, as indicated by the arrow 6 in Fig. 5.

Referring now to the drawings, there is shown in Fig. 1 an unfinished mouthpiece it, for exam.- ple, the mouthpiece for a saxophone. Said mouthpiece If! is provided, as shown with an in,- ternal cylindrical bore having the angularly related longitudinal portions l2 and Hi. The bore portion I 3 may be referred to as the embryo tone chamber of the mouthpiece. The mouthpiece in its finished condition is shown in Fig. 2 and is It will be observed that the tone chamber [4A is of frusto-conical shape at least in the major portion of the length of said chamber. In other words the inner peripheral wall of the tone chamber is conical but the forward end portion of a part of said wall may be flat instead of circular in peripheral contour, as indicated at E6 inFigs.

2 and 2A, said flat portion merging into said circular part.

Referring now to the means of the present invention for providing the internal peripheral wall of the mouthpiece with the desired shape, said means comprises a conical grinding or cutting tool 58, means including a rotary chuck 2i] actuated by a flexible shaft 2| for rotating said tool about its own longitudinal axis, and means including a spindle 22 for moving tool [8 in an orbital path around the inner surface of the bore in engagement therewith. Spindle 22 may be rotated about its longitudinal axis in any suitable way and is provided with an eccentric pin 24 which is engageable with the adjacent end of the grinding tool la in a central recess 2-6. It will be understood that spindle 22 is mounted in fixed position for rotation and, as illustrated in Fig. 3, tool [8 when engaged by the eccentric pin 24 is caused to revolve in an orbital path with reference to the mouthpiece or other article subjected to the action of said tool. The apparatus of the present invention comprises a holder 28 for the mouthpiece or other work which is subjected to the action of the tool It. As here shown said holder comprises a frame 38 provided with an opening 32 in which the mouthpiece or other article is secured in stationary position. ,As here shown holder 2-8 is provided with a clamping shoe 34 and a clamping screw 36.

In using the means of the present invention for forming the tone chamber 1 4A, the unfinished mouthpiece I0 is clamped in the holder 28, as illustrated in Fig. 3, and a cutting or reaming tool l8 of the appropriate size is attached to the rotary chuck 2t and brought into operative connection with the eccentric pin 24 of the spindle 22 and in engagement with the internal surface of the embryo bore [4 of the mouthpiece l0. Spindle 22 is rotated slowly, say at a speed of about 2 R. P. M. thus revolving tool is around said surface in engagement therewith while said tool is being rotated by shaft 2!. In the form of the invention illustrated in Fig. 3 the rotary tool 18 is held by hand at the handle I-I, while the outer end of tool it is engaged by the cocentric pin 24. As the spindle 22 rotates slowly, the operator can guide the tool manually for holding the latter in proper relation to the work. It will be understood that several rotary grinding tools of difierent sizes may be used during the operation of forming the bore of the desired frusto-conical contour. In Fig. 3 the largest grinding tool is illustrated while in Figs. 4A and 4B grinding tools IBA and IBB, respectively, are utilized, in the order named prior to the use of the largest grinding tool i8 which is shown in Fig. 3. It will be understood that the grinding tools are all of the same construction and shape except that they are of diiierent sizes. Also, as illustrated in Fig. the end of spindle Z2 is provided with a plurality of recesses 25 at different distances from the axial center of said spindle. Said recesses are preferably threaded for removably receiving the eccentric pin 2 In this connection it will be understood that the eccen+ tric pin 24 may be removably secured in either of the recesses 25.

As previously stated, the tone chamber MA of the mouthpiece WA may have a forward end portion thereof which is non-circular in peripheral contour or which has a different radius of curvature than that of the major part of the peripheral surface of the tone chamber, as indicated at [E in Fig. 2A, in comparison with the circular peripheral wall of the tone chamber MA illustrated in Fig. 4. This formation at the forward portion [6 can be produced by the manipulation of the grinding tool 18 by the operator of the device, since as described above the grinding tool is held in the operators hand by the handle H rather than being mounted in a fixed bearing, so that the adjacent part of tool I8 is variably movable while said tool is revolved by the ro- "tary eccentric means.

In .the form of the invention illustrated in Figs. 5 and 6 provision is made for supporting the tool I8 for movement in a definite path instead of under the guidance of the operator as hereinbefore indicated with reference to Fig. 3. Thus,

as illustrated in Figs. 5 and 6 the apparatus ineludes means for holding and revolving the outer end of tool it while the inner end thereof is revolved by the eccentric pin of the spindle 2.2 as described above with reference to Fig. 3. The means for holding and revolving the outer end of the tool 18 comprises the device 38 which includes a fixed frame 48 provided with an axially movable bearing member 32 mounted therein and an eccentric member 45, fixed to a rotary shaft 46 carried by the bearing member 42. centric member 44 is provided with an eccentric recess '4! in which the end of the stem 68 of tool It is-engage'd. It will be understood that eccentric member 44 may be provided with a plurality of eccentric recesses at difierent distances from theaxial center of'the memberto correspond to the distances of the plurality of recesses 25, respectively, of the spindle 22. It will be understood that the rotary eccentric id and spindle 22 are operated at the same speed. Shaft 4-5 may be rotated in any suitable way for rotating the eccentric member M, as here shown said shaft is provided with a gear 553 which meshes with a driving gear 52 rotated "by any suitable means (not shown). It will be understood that shaft 46 while rotatively mounted in member $2 is in fixed relation to said bearing member longitudinally thereof so that by moving said bearing member 42' the eccentric member t4 may be engaged withand disengaged from the stem 48 of the grinding tool. For thus moving bearing member 42 and the eccentric member Mcarried thereby, the bearin member 42 is provided with a rack 54 which is engaged by a pinion 56 mounted in the supporting frame All. Pinion 55 is operated'by a hand wheel 58. The tool I8 is rotated in any suitable way, here shown as a flexible drive shaft 69 provided with a worm gear 62 which meshes with a worm wheel 64 fixed to the stem 48 of the grinding tool.

It will be understood that various changes in the form of the invention and in the details of construction and arrangement of parts maybe made without departing from the underlying idea or principles of the invention within the scopeof the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

1. Means of the class described comprising a rotary conical reaming tool having a free, end

Said ecand increasing in diameter toward said end, and means for revolving said tool in an orbital path, said last mentioned means comprising a spindle having an'eccentric pin engageable with said tool at said free end thereof at a point in line with the central longitudinal axis of said tool, the other end of said tool having a handle for manual operation of said other end of the tool, under the control of the operator, in variable paths.

2. Means of the class described comprising a holder for work provided with an internal bore, a rotary reaming tool having a free end and adapted to be inserted in the bore of the Work in said holder, through one end of said bore, and rotary means projecting into the bore of the work in said holder, through the opposite end of ,said

"bore, and provided with eccentric means releasably engageable with said end of the tool axially thereof for revolving said tool about the axis of the bore of the work, means for bodily moving the other end of said tool, and flexible means operatively connected to said tool at a distance from said free end thereof for rotating the tool about its own axis.

'3. Means of the class described comprising a holder for work provided with an internal bore, which has angularly related portions, a rotary reaming tool having a free forward end adapted to be inserted forwardly through one end of said bore into one of said angularly related portions, eccentric means adapted to be inserted through the opposite end of said bore into the other angu larly related portion thereof and releasably engageable with said free end of the tool for revolving the latter in said one of the angularly related portions of the bore, means for bodily moving the other end of said tool, and flexible means operatively connected to said tool at a distance from said free end thereof for rotating the tool about its own axis.

4. Means of the class described comprising a holder for work provided with an internal bore, which has angularly related portions, a rotary reaming tool adapted to be inserted through one end of said bore into one of said angularly re lated portions, and eccentric means adapted to be inserted through the opposite end of said bore into the other angularly related portion thereof and releasably engageable with said tool for revolving the latter in said one of the angularly related portions of the bore, said tool having a handle whereby the user of the tool may variably move the latter bodily while said tool is revolved by said revolving means.

5. Means of the class described comprising a holder for work provided with an internal bore, which has angularly related portions, a rotary reaming tool adapted to be inserted through one end of said bore into one of said angularly related portions, eccentric means adapted to be inserted through the opposite end of said bore into the other angularly related portion thereof and releasably engageable with said tool at one end thereof, other eccentric rotary means releasably engageable with said tool at the opposite end thereof for revolving said tool in conjunction with said first mentioned eccentric means, means for rotating said two eccentric means at the same speed, and flexible means operatively connected to said tool at a distance from said one end thereof for rotating the tool about its own axis.

6. Means for forming a conical surface on the. peripheral wall of the internal bore of an articlev in which said bore has longitudinally extending adjacent angularly related portions, said means comprising a rotary spindle extending into one of said portions of the bore through one end of the latter, a rotary conical cutting tool having a free end and increasing in diameter toward said end, said tool extending into the other portion of the bore through the opposite end of said bore, the wider end of said tool being adjacent said spindle, interengaging means between said spindle and tool at said wider end thereof for revolving the latter around and in engagement with the surface of said other portion of the bore, and flexible means operatively connected to said tool at a distance from said wider end thereof for rotating said tool about its own axis.

WALTER GEMEINHARDT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

